# Function composition The composition counts of n into k parts. composition only takes integer arguments. The following condition must be enforced: k <= n. ## Syntax ```js math.composition(n, k) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `n` | Number | BigNumber | Total number of objects in the set `k` | Number | BigNumber | Number of objects in the subset ### Returns Type | Description ---- | ----------- Number | BigNumber | Returns the composition counts of n into k parts. ### Throws Type | Description ---- | ----------- ## Examples ```js math.composition(5, 3) // returns 6 ``` ## See also [combinations](combinations.md)